22021564 has 6 divisors (see below), whose sum is σ = 38537744. Its totient is φ = 11010780.

The previous prime is 22021561. The next prime is 22021567. The reversal of 22021564 is 46512022.

It is an interprime number because it is at equal distance from previous prime (22021561) and next prime (22021567).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2752692 + ... + 2752699.

Almost surely, 2^22021564 is an apocalyptic number.

It is an amenable number.

22021564 is a deficient number, since it is larger than the sum of its proper divisors (16516180).

22021564 is a wasteful number, since it uses less digits than its factorization.

22021564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5505395 (or 5505393 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 22021564 is about 4692.7139269297. The cubic root of 22021564 is about 280.2954534367.

Adding to 22021564 its reverse (46512022), we get a palindrome (68533586).

The spelling of 22021564 in words is "twenty-two million, twenty-one thousand, five hundred sixty-four".